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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc4a53e9848ee1d43247174975a9da8b180798ff4e50d66b5cbec066398e69f' 
  AND token = 'm8xw2rAot2BKIwcqP1j0s0NCkOvZoWZ5xk6VPqxXWh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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