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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56f7be5d6fd9791abcd5413d6ca486dc47d8491f4c0eaf7e7d5e2ac5093494d' 
  AND token = 'B5ZHV5E/pgR/bxoRCgv9e6IgxYN9Okh0w49v83tvOVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}