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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b85c47f20d2d8aee613984c43438c2082a8f7dac7f2fe4db63ed53f107267c' 
  AND token = 'emXuYSPBDVTHYOXw01TH4IMxEyGtskgd7k2NcgbeYuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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