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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b9406bc4985ce9c6d7c15da58a8a262a186eabceb5186de0e4ae7a3418307a' 
  AND token = 'ElPxP750R+DIdZdgwzN9J/jIgavbUIeqVh7nR9bAHLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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