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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dec7ae731364f95daed71e89c76297a9dc4f897a9dea9b7d9c417e104e9e6c' 
  AND token = 'w5z6qx2T+SOAbqbAbfWB/+Gus6Rlf7/1u9usJVZmEog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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