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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70adcd11d862951f9d3f8a25953bb37982bf37e9cb172d1349204b767c58a90f' 
  AND token = 'dapbUUfnT2/kfMwQHbW7nZpYJXpzGUMx804zQtDsHiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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