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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0450a55b9388151ab5267185dcea85c4eb23d2056e4de202fdf79d0aef1c5dd2' 
  AND token = '1SgXE4wvFBUxy0I6C4fLmRJGyRNhjx+S1mflImL7V/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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