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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcce415145aaf4b53c9c3a763c58e57b54664796493566071d9a63f9eeddc082' 
  AND token = 't4oMDOX98XosFcD1ceHekZ+0dQYzY0W/JYlaIGL2SwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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