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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b9d1188e746b7b8f8ab2911d94b959bbe55f4cd7cf1f1555c369ab898f7be5' 
  AND token = 'J0eggbxzCNvAMUAi3g5liXBxYnvgnPhM0rZROz/cKYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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