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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985e05dbd761c3fda266c2a29fb099c97bcc645e3db54fc80b45e7acd4a0c3f4' 
  AND token = 'eM8MO6r114OqVHrV6sYM6a5pr0nI+1icCpb+HicqEwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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