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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566b81328854f11d64effbf1010b0ed6370df3d8a93fcd375f0a2dc42387c56b' 
  AND token = 'zNGdm6IHShqaJS68yAB60lFev5p1w9yJshZNSiKfU5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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