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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f193cfa2c7d48d3c0c366a0ae844d56d7ec1b0bf4e2b56adc6f744d05ec0c15a' 
  AND token = 'cXbocxHp+osruOT1E9X8OyJMVZSz4WqimMt2UlBha/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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