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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea9bb30c6ad279d2f4c89e3ccb053c98fee738ce7de294ee9951e786e523aec' 
  AND token = 'sPa85iOhykQC1dwZEl1XlOxZa2tdwcAwFGpx8BRibi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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