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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3616031daef322cb531e1a9c8b3e06f1544e30ef2ddafb60796fd4b2df621a39' 
  AND token = 'GfBFfTuAdWKpHUqy8hpfGitQuSfHRQzzSR6KpL5ZOm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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