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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a042a4bd00b01cea2a1ea872ef988f25bcb0c7275a3a242faae53e2a2aa3c7' 
  AND token = 'HjQstUw6HwSJowv2GFC8lN5ssh5qH2E9Qyf7YxY6vI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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