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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2ff56ad62f573f0bfed31281f658cc6b8eb82cccd0d82f9595286bc4b90f45' 
  AND token = 'yQu0VXc3a9YJXO8hWEqPmbSCFS4bHX/mOPouWS45/SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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