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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c68d867baa996221de9290f6cb21c9b1356d29cf3acd545363865998127cc4' 
  AND token = 'k0ALDnBMpCLFfPoo8OLP7U4G+aFwg5MYsevU2W3MCWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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