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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b9ead261114fefb0e3933ce026e8ce25e9da0ecacc728589c02de46d7f12d8' 
  AND token = 'UyXCdfdHNx4Hp5Un+4sWouM49jYlPj0RP0diA39HHUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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