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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835dca24c9c849d1ecb8f47a172233d418c2f5634336f6eb368fc7c7c59637e1' 
  AND token = 'WVPkExK43hoVvwXRfsk9kolFQplqxbizCbcbzrZIcT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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