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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43b92e8ff6f4887fa67f385577c9d97a0dfee00fbece5fca091d89a7a90bf65' 
  AND token = 'zLC+2CEA5aEWFlDCxhLSlqLae4wOUNEy0YHJfQZX0HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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