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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5656630985c13d6c12c826cc5ec6817282bf582aff7787f53fd7cf301fb31a31' 
  AND token = '8gUan2e2wRULoGvfu62R46tCTbxZbNNKiBfAjF1MVRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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