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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a143da03200a2f9629b3d11789a334b18047c4f8ce7cecc89274eb1f4e4b54' 
  AND token = 'hYnmT6Pom3qvTSSNyLPyMjctG49TbUd0w3inExDsdRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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