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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76306df0c100744466330ecb651f61db152e15836cf3cd9d0d9530b56e0b3e63' 
  AND token = 'YMpVuB73K+pUAiqIeLawPz6oWKIWxyyq8HFTnMtgr20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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