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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd8df65977f79df203744bda3d3626433d713544f43121fa3698b4ac3e4abe4' 
  AND token = 'dCavWPXYP0Orqm63GB4plzYyue6noP8Kc2DFgXzW2p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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