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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40f6fe5f00cfbd3e7556e79c06ab495da0289982cb5f28145f335d1f3b4f7ec' 
  AND token = 'fALGoQa221joZH8pdaNIhuH9wYsp5zNY2vbScp41Q7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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