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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4409137a1770da55e076a7c04526234984389cf5c8f95d801ca79c30bfe4b7' 
  AND token = '8c5r3HpVVDdq0xiWn8kEXGAkhWzApxVBrsR0YftqVYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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