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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732a8d0886cce61c0e373941693ce528f24318ee93c94fa52b40dca225051bd8' 
  AND token = 'p7IXzwuW+VUfnt1N4zey/W/3C14cjXgyRJeoAB4oVxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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