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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7033ebd72f62ddfd3ad16134c7e204fdb85e0c82556d1220f9a4b31888b4474b' 
  AND token = 'TxaS2qUF9eJwHKAS49SZFc4L/WHxE/lvAOVswe6TwCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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