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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13249eab580d912234d47e57f2745a3264b734baadf23816f51fefa8e780c4a2' 
  AND token = 'zK/trJx3jj4WFMi9gZ28tx9nPcRTDQwr+CJ1Mr4Cjy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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