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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af514192c7fbcdd3d6a5c1c4f0c5c7f829ad16b32c2f72ce78ba09619ca37a76' 
  AND token = 'v9o3bpgudCW6UNBjoaUMZxjMOwQOjTCm8KX9tH1mPRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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