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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229e0a0c6872fcd4e16857c343d71515bd288cf03b00c8a007523b48f4b14cb5' 
  AND token = 'krIlHy/iqa9BZSfW5JfMqKaDw0QbuHWG9zti7VwZ4i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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