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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1ac660c7aa07d4ece64ae98b4e1a01d5f87f6a12edbefb0ca5d838f876f02f' 
  AND token = 'o0ojpMZFzze+H2o306/ac8ouz62FySjFPiocqhyFqWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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