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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ae49a7f1479238b17211d1ba327180fe69aa9ef919cfe2e148bc146821a6c6' 
  AND token = 'w8cN/xGXx3df05p3+pLd9yXoejlUV4N7+j7vzUy3I9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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