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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652598811043caf26d19cba32b88c7f71e991a3708c689053ed94b5e8e838f3e' 
  AND token = 'zx/NDLk0ZMn9x0g6kthMKjDUaEEpx6Aomhb7md75NiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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