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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07bee70b5eba97f7611349167433a082abf31663bc315cc705a7457cc5351db' 
  AND token = 'PvbPkstI6IREVpGWYNIz5tcWeIcpBlceMALu7KNsblI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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