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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b55691a89a0d126d96df3a52c5a4f1090ea470444faa26701125df86b81d03' 
  AND token = 'YvyVIdkQk7fDtU20w7nzEahrVut3Otq3UZLpw9cW3/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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