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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bff8f7def90d6b2ffcc34ab4da6fa698965b56e1e2e84b0ec28c1e2677baeec' 
  AND token = 'UA9BLUdiqnW3sxPyR0qavw4IF9DiShJa+x7pfswTPI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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