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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bc3bf08a593175fdbd50a6f804284a1ee64c1cbe74f048d4a25a60e1df5267' 
  AND token = 'ezBi6UKQJ0UhILDVd9znCobvdwqMRMCmkyeLIb7J7VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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