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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fece8579091003ef98ed49638e9268a19c2a882fd30da564efc8fcb4537c6741' 
  AND token = 'rceT4aOwT3AzxfQ7k3IjJ8t3AZ/Yd20/GTR1ymk2EEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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