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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61c3a0d277cf20cfa29338078127b0a59869444aa36310616f8993614abbebc' 
  AND token = 'F04u0V2YQ2cNpTmbnymAd8vhWSK57he0nKQSIpakvco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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