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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ed178131cf136e4607dd6cacdd10d7d3a7fe5ce56ca01c32e68c7e8788bf92' 
  AND token = '18uHu/Rn9CESMFD8/rdEv63nv0IYQTtYFxcPw8cV+bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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