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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba938ff4bf566d06a683b1005906543a91921cd358b6b112d195626e561df5d' 
  AND token = 'pL+jrzUphUmtIwVy9lfInufaZ73qMYmiFnR92rYSfyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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