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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f2cffae45bab993c0f1e8eb41304f40cf2dbafe1e0fdf1e83f7dea6a8a40ef' 
  AND token = '9uAkTfx8zH6IQScL73KM1sNXKSOpaBAtN1SHttg/tRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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