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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040d8ea4ac0114702122bfa06e10262ae70cab2a564835eb06c0ed1617bbfd03' 
  AND token = 'Vbi42YUMedhD3iwzhcpx5VkCtb/1eoKW3ClsH4QbmHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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