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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeae85ac7e0e1c85b019ae148df2a109b87861fd0b2fd4cf13d6306e6b5fc4c7' 
  AND token = 'YPuT2UMelnaqPAa3I5X8fNHqKHFTYTES22GScfWMCbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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