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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd854076feb6569ed6137f5ae0cfc3c646b37217770edfeec261c249dbe77fbe9' 
  AND token = '1znd2bPhuPGZ5NU+g1nU5VBZjXN/6RLTI0RgFaomsho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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