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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd77bf8baf8f8432d7492b414d7e3b3b56b83bc097a2acbe39a18bd68b5a4efb' 
  AND token = 'bWiPrCIIh4jgDPwXDOb4VmhIF5POhM2Bd74UkftSiW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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