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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c4d47956531e21a28f43050010a9e75362c1e304d3d79c47ecf7ce611013b6' 
  AND token = 'fhoTKaT8JQhlP+AMkAs0LbKUHp4NzfODqNnBLw9Qif8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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