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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee8a80600b1c8e60561e50f610dd564eb23a1fc37afbebeed107829c4554974' 
  AND token = '8g31Mn1IJQSPAviieJOSm9jD23pPz9ApebSCqMDFEto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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