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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b0e356dda51e59f1daf805afa85674eca7bae77dbdf0708bd68b3fe4b6b416' 
  AND token = 'LPlU6OeDM0KewAz8m9UWE8gCUq24ZRDMNHo31vr7ziQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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