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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c2dd5126136550b786aec97f15f2c0456dd10b6e3fb925bc78b6d14a79907c' 
  AND token = 'pVdUabD+bvL4ZK79dre/7l2Q83jU6FH8pUXvs6YV6R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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