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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e91e0281b1dc3e6fce9bb856d92a036604b250cc36f21a0046a5ab920c89bb' 
  AND token = 'y0aGno0lbbyxnRz+c5d2PfwWM9Vi7EO+v9/IscqL56k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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