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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b098fb36a1b1115e5eab7890b81a2f6370575c2edd23eb87833a549dc5ba2ea' 
  AND token = 'EUkcQT5XgGh1dPeivrqQfYmELX2QMKLqrBpsJvVNlkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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