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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fc671c04ca0744e6e3b9cefe80e3f27eec45b251361c570ce87d54bc8a7c67' 
  AND token = 'KZ5CJZ1y7/h9p10JXyuxcwlz5yOuCoa2Ml/AW3T+R78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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