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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce40c044f3e2178a005775b7f22c67d484fa04bb1892bdf93b4ae687480c5fe' 
  AND token = 'rj1zNQPqNkUqVNBOVEV16XxXBW5XeiI4RnMOWSf/iAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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