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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4663495c4c2187d626341b6a124aaaa720bdb3c728ce54f60039700c0ea07c1c' 
  AND token = 'qJpfFRLKp9Dpuozo1cQ/ImWrPxNkT3xIj9qaPIW+VOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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