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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78572675936e90a584ac678dea60e8839d4037d94662fbf3b58394d222a5d4b9' 
  AND token = 'XKHfjxAO00eiM3/FBg0UUEuZ/x9OaG+e6Qj4fENA9po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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